Ornamental stitching attachments for sewing machines



J. P. ENOS April 1, 1958 2 Sheets-Sheet 1 INVENTOR John P Enos ATTORNEYWITNESS 'no 54 55 Z wic c bfl/ April 1, 1958 J. P. ENOS 2,

ORNAMENTAL STITCHING ATTACHMENTS FOR SEWING MACHINES Filed Oct. 8. 19542 Sheets-Sheet 2 ATTO NEY United States Patent ORNAMENTAL STlTCI-HNGATTACHNIENTS FOR SEWING MAHINES John P. Enos, Union, N. J., assignor toThe Singer Manufacturing Company, Elizabeth, N. J., a corporation of NewJersey Application Qetober 8, 1954, Serial No. 461,149

24 Ciaims. (Cl. 112-160) This invention relates to work-joggingattachments for sewing machines, and more particularly to a pattern-camcontrolled work-jogging attachment in which the cam is readilyinterchangeable so that any one of a number of ornamental stitchpatterns may be produced simply by insertion into the attachment of theproper pattern-cam.

It is an object of this invention to provide a Workjogging attachment inwhich the pattern-cam may be removed and replaced without dismantling ordisassembling any other part of the attachment, so that the danger ofmisplacing attachment parts or of improperly reassembling parts isobviated.

It is also an object of this invention to provide apattern-cam-controlled work-jogging attachment in which the pattern-cammay, by one simple movement, either be separated from or positioned intooperative relation with the cam actuating means as well as with the camfollowing means.

Still another object is to provide an ornamental stitching attachment ofthe above character having a frame cover which encloses the actuatingmechanism of the attachment and into which a circularly movingpatterncam is shiftable axially through an aperture in the frame coverinto operative engagement with the actuating mechzansm of theattachment.

Another and more specific object of this invention is the provision of awork-jogging attachment having a vertically arranged pattern-cam shafttogether with a pattern-cam which may be dropped on said cam-shaft andinto operative engagement with a cam follower.

Still another object of this invention is to provide a pattern-cam whichis constructed and arranged in a novel manner so as to be insertablereadily into an ornamental stitching attachment of the above character.

It is also an object to provide an interchangeable pattern-cam which isformed with means whereby it may conveniently be gripped and shiftedinto or outof the work-jogging attachment.

'With the above and additional objects and advantages in view which willhereinafter appear, this invention comprises the devices, combinationsand arrangements of parts hereinafter described and illustrated in theaccompanying drawings of a preferred embodiment in which:

Fig. 1 is a top plan view of the work-jogging attachment of my inventionas it is applied to a sewing machine and in which the frame cover lid isillustrated in open position, and a small portion of the lid shown indotted lines in its closed position to illustrate a cam positioning markthereon.

Fig. 2 is a right side elevational view of the attachment andillustrates the frame cover lid in closed position in solid lines and inopen position in dashed lines.

Fig. 3 represents a cross section taken substantially along line 33 ofFig. 2.

Fig. 4 is a bottom plan view of the interchangeable pattern-cam.

. Fig. 5 is an enlarged top plan view of the work-jogging attachmentwith the frame cover removed and the pattern-cam illustrated in phantomlines so as to expose the actuating mechanism.

Fig. 6 is a right side elevational view of the attachment of Fig. 5 withthe pattern cam illustrated in cross section. I

Fig. 7 is a left side elevational view of the attachment with thepattern-cam sectioned substantially along line 7-7 of Fig. 5. V 7

The ornamental stitching attachment of this invention is preferably ofthe well known sewing machine attachment type of construction in whichthe attachment is rigidly secured to the presser-bar of the sewingmachine and the reciprocating needle-bar of the sewing machine isharnessed to drive the attachment. Referring to the drawing, thisattachment is constructed upon a frame which comprises a base plate 10from the forward portion of which extend spaced upstanding ears 1111between which is secured, as by rivets 12-12, ametal block 13 which isslotted at 14 forwardly of the ears 11-11 snugly to accommodate thelower extremity of a sewing machine presser-bar 15. A knurled fasteningscrew 16, of the type normally employed to secure a presser foot to thepresserbar, serves to maintain the block 13, and hence the attachmentframe, securely in place on the presser-bar. The screw 16 is shouldered,as

at 17, to provide a necked portion 18 which is confined loosely withinan inclined aperture 19 formedin "a finger 29 extending forwardly fromone of the upstanding frame ears 11. A slot 19' is formed from theaperture 19 to the edge of the finger 20 so that during assembly theaperture 19 may be opened for reception of the necked portion 18 of thefastening screw. After the fastening screw is in place, the finger 20may be flattened into its original configuration so as to hold thefastening screw captive in the aperture 19 thus insuring that it cannotthereafter become misplaced.

Power to drive the work-jogging attachment is derived from thereciprocation of a sewing machine needle-bar 21 by means of an actuatinglever 22 carried by a fulcrum pin 23 which is journaled in theupstanding ears 1111 of the attachment frame. The actuating lever 22 isbifurcated at its free extremity and is disposed to embrace acylindrical projection 24 of a conventional needleclamp 25 into whichprojection a thumb screw 26 is threaded so as to secure a needle 27 tothe extremity of the needle-bar 21.

The reciprocation of the needle-bar thus imparts oscillatory movement tothe actuating lever 22. This oscillation is utilized in a manner whichwill presently be described in detail to impart lateral swinging motionto a work-feeding foot 28 which forms a part of the attachment. Thework-feeding foot is bifurcated as is illustrated in Figs. 1 and 5 andis formed with a transverse slot 29 to accommodate the needle as thefoot 28 is swung into an extreme lateral position at either side. Ashank 30, which joins the work-feeding foot, is ofiset upwardly at itsjuncture with the work-feeding foot 28 and is formed with a longitudinalslot 31 which embraces a fulcrum pin 32 about which the shank and thework-feeding foot turn. The fulcrum pin 32 extends upwardly from a slideplate 33 which underlies the shank 30 of the feeding foot. An upwardlyextending guide pin 34 which projects from the slide plate 33 engages asimilar slot 35' formed in the bottom plate 10 of the attachment frameso that.

turned upwardly to provide a flange 36.which at theirear ward extremityis provided with an outturne'd finger grip 37. The fiange36 is .slotted,as at 38, to accommodate a clamp screw 39 which is threaded into the car11 of the attachment frame, and which serves to lock the slide plate 33in a selected position of adjustment longitudinally of the frame. Withreference to Figs. or 7, it will be apparent that the position of thefulcrum pin 32 in the slot 31 of the feeding foot shank will control theextent of lateral motion of the foot for any given degree of actuationthereof since the lever arm from the feeding foot to the fulcrum pin maybe lengthened or shortened by adjustment of the position of the fulcrumpin 32. Rearwardly of the slot 31 the shank of the feeding foot isoffset an additional amount upwardly and is therein provided with anupstanding cam-follower pin 40. The upper extremity of the cam-followerpin is shouldered and is fitted with a roller 4-1 which is secured onthe pin 40 by the upset top portion of the pin. The shouldered base ofthe pin 4% is disposed in a transverse slot 42 formed in an archedbracketmember 43 which is fastened as by screws 4444 to the base plateit of the attachment frame.

The manner in which oscillatory movements of the actuating lever 22 areutilized to transmit transverse work-jogging motion ot the feeding footwill now be described. The actuating lever 22 is provided with adownwardly extending arm 45 formed at its extremity with an outturnedlug 46 which is embraced by spaced upwardly projecting fingers 47-47 ofa slide plate 4% which is confined to movement longitudinally upon theattachment frame by means of a pair of pins 49-4-9 which extend upwardlyfrom the base plate 1% of the frame and are fitted into longitudinallyarranged slots 50-50 formed in the slide plate 48 Pivoted on the slideplate 48 by means of a pivot pin 51, is a pawl 52 which is biased bymeans of a wire spring 53 in a counterclockwise direction, as viewed inFig. 5, and into operative relation with a ratchet wheel 54-. Theratchet wheel 54 is preferably formed with an integral upstandingcylindrical hub portion 55 which is formed at its free upper extremitywith a shouldered portion 56 of reduced diameter. The ratchet wheel 54is confined for rotation on a cam stud-shaft 57 which is secured on asubstantially vertical axis in the base plate 10 of the attachmentframe.

Indicated generally in the drawings as 58 is a patterncam which ispreferably formed with a fiat cylindrical bottom portion 59 and anupwardly extending finger grip portion 60 which is frusto-conical inshape and which is fluted to provide a more secure grip. The bottomportion 59, as best shown in Fig. 3, is formed with a tapered axial bore61 of which the mouth is downwardly flanged,

to provide, in effect, a deeper bore. The bore 61 of the pattern cam isadapted to embrace the hub portion 55 of the ratchet wheel 54 on the camstud-shaft 57.

As is illustrated in Fig. 3, the tapered bore 61 of the pattern-cam whenit is positioned on the cam-shaft and on the ratchet wheel hub makes aring contact at the upper edge of the shouldered portion 56 of the huband another ring contact at the upper edge of the main hub portion 55.In practice it has been found that by this arrangement, a moresatisfactory fit may be obtained between the cam and the ratchet wheelhub than if both parts were to be made, for instance, of the same taper.In other words, if both parts were tapered, any variation in tolerancesof the parts or any grit or other foreign matter that should happen tobe carried between these parts would cause the cam bore to seatimproperly and thus make the cam wobble on the hub.

In order to provide a readily separable driving interlock between thepattern-cam and the ratchet wheel which is fast on the cam stud-shaft,the upper free extremity 56 of the ratchet wheel hub is formed at eachside with a .notch 62. Complemental to the notches 62 in the hub, arelugs 63-63 which are formed at the bottom of the axial bore 61 in thepattern-cam 58. As the patterncam is lowered axially upon the ratchetwheel hub, two

positions exist 180 apart in which the cam bore will seat completelyupon the hub with the lugs 63-63 disposed within the notches 62-62. Itwill be clear, however, that while this is the preferred manner ofinterlocking the parts, any variation of this form is Within thecontemplation of this invention provided only that the interlock must beestablished and separated upon only a relative axial movement betweenthe parts.

The flat cylindrical bottom portion 5% of the patterncam is providedwith a cam groove 6-1, as best shown in Fig. 4. The cam groove is formedin the bottom face of the bottom portion 59 which is the face oppositethat from which the finger grip 60 extends. Referring to Fig. 3, it willbe clear that the roller follower 41 is carried on a vertical axis whichis parallel to the vertical axis of the cam stud shaft 57. As thepattern-cam is shifted axially with respect to the cam-shaft, therefore,engagement or separation may readily occur between the axial bore 61 ofthe cam and the ratchet wheel hub on the cam shaft, between the lugs63-63 in the axial cam bore and the notches 62-62 in the ratchet wheelhub, and between the cam groove 64 and the cam follower. The ratchetwheel hub provides an axis about which the pattern cam is supported forturning movement, the notches 62-62 and the lugs 63-63 provide a meansfor locking the cam operatively with respect to the actuating mechanismof the attachment, and the cam groove and follower, of course, providethe means for jogging the workfeeding foot from side to side. Thepresent construction thus provides a mechanism whereby these means mayall be brought into operative unity merely by the relative axialmovement of the pattern-cam into place upon the carnshaft.

Referring, more particularly, to Figs. 1, 2 and 3, the attachment isprovided with a frame cover indicated generally as 65. The cover 65 isformed with a forwardly extending arched hood portion 66 which encasesthe up standing ears 11-11 of the frame and which is apertured toaccommodate a fastening screw 67 which is threaded into the metal block13. Rearwardly of the hood portion 66, the cover 65 is formed with aflattened and broadened portion 68 which serves to encase the actuatingmechanism of the attachment. This flattened portion 68 overlies the baseplate 10 of the frame and is secured to the base plate by a fasteningscrew 69. An aperture 70 is formed in the top of the flattened portion63 of the frame cover which, as shown in Fig. 1, serves to expose theaxially projected cross sectional area of the pattern-cam 58. A lid 71which is hinged to the flattened portion of the frame cover by the pivotpin 72 is arranged to be opened to a positon as shown in Fig. 1 in whichthe aperture 70 is uncovered and the pattern-cam may be lifted axiallyout of engagement with the mechanism of the attachment. In Fig. 2, thelid 71 is illustrated in solid lines in its closed position. The lid isformed with a clearance aperture 73 through which the upwardly extendingfinger-grip portion 60 of the patterncam extends, as is illustrated inFig. 3 and as is shown in the fragmentary dotted line position of thelid in Fig. l. A pair of leaf spring members 74-74 are secured insidethe lid 71, as by rivets 75-75, one spring member at each side of thelid aperture 73. Forwardly of the rivets 75-75 the spring members aredownturned, as at 76, to provide a latch lock which engages the framecover and resiliently maintains the lid in closed position. The springmembers 74-74 rearwardly of the rivets 75-75 are arched downwardly, asat 77-77, and are disposed as illustrated in Fig. 3 to bear downwardlyagainst the cylindrical body portion of the pattern-cam 58. When the lidis latched in closed position the spring portions 77-77 of the lid 71thus serve to retain the patterncam seated on the hub portion 55 inoperative relation with the cam follower 41, and to apply a frictionalbraking action to the pattern-cam to prevent overthrow or retrogrademovement thereof.

By means of a protruding finger-grip 78 formed on the frame cover lid71, the spring latches 76-76 on the lid may easily be flexed and the lidraised to the position illustrated in Fig. 1 or to the dotted lineposition of Fig. 2 to expose the pattern-cam 58. By gripping thefingergrip portion 66, the cam may be lifted vertically out of theattachment and a selected one of a plurality of cams, each with adifferently organized cam-groove, may be reinserted simply by droppingthe desired cam vertically upon the ratchet wheel hub. To facilitateselection of the desired cam, a representation, as shown at 79, may beembossed, etched, or otherwise marked on the exposed face of thepattern-cam finger-grip to indicate the shape of the ornamental stitchpattern which that particular cam will produce. In practice it may benecessary to turn the cam upon insertion so that the lugs 63-63 in thepattern-cam bore will enter the notches 62-62 and also so that a portionof the continuous cam groove will be brought into registry with the camfollower so that the cam follower will enter the cam groove. With thearrangement of notches 62-62 and lugs 63-63 of the preferred embodimentit should not be necessary to turn the cam more than 180 to accomplishthis necessary alignment and in any event, this simple turning operationwill automatically result in the proper registry and cooperation ofparts. When the cam drops into place, the lid 71 is closed and the latchsprings 76-76 resiliently maintain the lid in closed postion and theportions 77-77 of the springs bear upon the pattern cam and hold it onthe ratchet wheel hub.

The width of the stitch pattern or, in other words, the bight of thestitches to be produced may be varied by adjustment of the slide plate33 and the consequent shift of the longitudinal position of the fulcrumpin for the work-feeding foot 28. This adjustment is accomplished byloosening the clamp screw 3h, and by means of the finger-grip 37,shifting the slide plate 33 to the desired position. Indicia arepreferably placed on the slide plate to indicate the range of bightadjustment that is possible. These indicia, as illustrated in Fig. 7,cooperate with a pointer 80 which is formed to protrude from theattachment frame cover 65, as shown in Figs. 1 and 3.

With the desired cam inserted in the attachment and the proper bightadjustment having been established, the attachment will be ready tooperate. As is conventional With work-jogging attachments of this type,the attachment serves only to jog the work laterally of a line of stitchformation, and the progression of work material past the needle dependson the feeding instrumentalities of the sewing machine.

In initiating a stitch pattern or in continuing a pattern of existingstitches, it is frequently desirable to know the location of the cam atany point in the stitch pattern or, conversely, it is important to beable to set the attachment at some logical starting point in a patternof stitches. i

For this purpose, the exposed face of the finger-grip 69 on the patterncam is formed with indicia preferably in the form of an arrowhead 81which is adapted to cooperate with a reference point such as a line 82on the attachment cover lid, as shown in Fig. l to indicate the camposition. It has been found most practical to arrange the arrowhead 81and the line 82 to correspond to a position of the work-feeding footwhich is centrally located with respect to the straightaway line ofstitch formation of the sewing machine.

From the foregoing it will be understood that upon operation of thesewing machine, the needle-bar reciprocation will oscillate theactuating lever 22 which, in turn, will reciprocate the slide plate 48.The pawl 52 carried on the slide plate will act to impart anintermittent turning movement in one direction to the ratchet wheel 54,such movement of the ratchet wheel occurring during the upstroke of theneedle-bar and while the needle is raised out of the work. Thepattern-cam, being secured for rotation with the ratchet wheel, will beturned a corresponding increment and by means of the cam groove 64, thecam follower roller 41 and, therefore, the workfeeding foot will bejogged transversely of the line of progression of the work fabric pastthe needle.

In many instances, it is desirable to be able to produce straight linesof stitches without removing the ornamental stitch attachment from themachine. In the attachment of this invention a throw-out lever 83 whichis provided for this purpose is pivoted, as at 84, to the slide plate 48of the cam-actuating mechanism. The throw-out lever 83 underlies aprojection 85 of the pawl 52 and is provided with an upstanding pin 86which enters a T-shaped aperture formed in the projection 85 of thepawl. The aperture includes a slot portion 87 corresponding to the crossbar of the T, which slot portion is disposed substantially tangential tothe normal path of turning movement of the pawl 52 about its pivot pin51, and a slot 88 corresponding to the leg of the T, which leg portionis disposed to extend substantially radially outwardly from the pivotpin 51 of the pawl. When the throw-out lever is in the positionillustrated in Fig. 5, the pin 86 plays in the slot portion 87 andexerts no influence upon the pawl operation. When the throw-out lever isturned to the throw-out position, as illustrated in dotted lines in Fig.5, the pin 86 enters the slot portion 88 which frictionally holds thethrow-out lever in the dotted line position and draws the pawl away fromoperative engagement with the ratchet wheel 54. In the throw-outposition, the slide plate 43 reciprocates idly and the attachment isineffective to jog the work laterally, and a straight line of stitchesresults.

Having thus described the what I ciaim herein is:

l. A work-jogging attachment for a sewing machine comprising anattachment frame, a work-shifting member, means defining a pivotal axisabout which said work-shifting member turns with respect to saidattachment frame, a cam follower carried by said work-shifting member,an interchangeable pattern-cam, means carried by said attachment framedefining a pivotal axis for turning movement of said pattern-cam, saidaxis being parallel to the nature of the invention,

pivotal axis about which said work-shifting member turns' with respectto said attachment frame, actuating means carried by said attachmentframe and adapted to be operated by said sewing machine for impartingstep-bystep turning movements to said pattern-cam, and both saidactuating means and said cam follower being disposed operatively todisengage said pattern cam upon axial movement of said pattern-cam inone direction.

2. A work-jogging attachment for a sewing machine comprising anattachment frame, a work-shifting member supported by said attachmentframe, means defining a pivotal axis about which said work-shiftingmember turns with respect to said attachment frame, a cam'followercarried by said work-shifting member, an interchangeable pattern-cam, ashaft journaled in said attachment frame on an axis parallel to thepivotal axis of said work-shifting member, means carried by saidattachment and adapted to be actuated by said sewing machine forimparting stepby-step rotary motion to said shaft, and complementalinterlocking means formed on said shaft and on said pattern-cam, saidcomplemental interlocking means and said cam follower being disposed foroperative engagement with said pattern-cam upon movement of said camaxially of said shaft.

3. A work-jogging attachment fora sewing machine comprising anattachment frame adapted to be secured to said sewing machine, awork-shifting member, means defining a vertical pivotal axis for saidWork-shifting member with respect to said attachment frame, a camfollower carried by said work-shifting member, an interchangeablepattern-cam, a shaft journaled vertically in said attachment frame,means carried by said attachment and adapted to be actuated by saidsewing machine for imparting step-by-step rotary motion to said shaft,and

7 complemental interlocking rneans formed on said shaft andon saidpattern-cam, said complemental interlocking means and said cam followerbeing disposed for operative engagement with said pattern-cam uponmovement of said earn axially of said shaft.

4. A work-jogging attachment fora sewing machine comprising anattachment frame adapted to be secured to a sewing machine, aWork-shifting member, means defining a vertical pivotal axis for saidwork-shifting member with respect to said attachment frame, a camfollower carried by said Work-shifting member, an interchangeablepattern-cam, means carried by said attachment and adapted to be actuatedby said sewing machine for imparting step-by-step rotary motion to saidpatterncam, an arrangement to facilitate interchangeability whereby saidpattern-cam may be sustained by gravity alone in operative relation withboth said cam follower and with said actuating means, said arrangementcomprising, a shaft journaled vertically in said attachment frame, anupwardly extending free extremity formed on said shaft, means carried bysaid attachment and adapted to be actuated by said sewing machine forimparting stepby-step rotary motion to said shaft, and complementedinterlocking means formed on said shaft and on said pattern-cam, saidcomplemented interlocking means and said cam follower being disposed foroperative engagement with said pattern-cam upon movement of said camaxially of said shaft.

5. A work-jogging attachment for a sewing machine comprising anattachment frame adapted to be secured to said sewing machine, awork-shifting member, means defining a pivotal axis for saidwork-shifting member with respect to said attachment frame, a camfollower carried by said work-shifting member, an interchangeablepatterncam, means carried by said attachment frame defining a pivotalaxis for movement of said pattern-cam, said axis being parallel to thepivotal axis of said work-shifting member with respect to the attachmentframe, actuating means carried by said attachment frame and adapted tobe operated by said sewing machine for imparting stepby-step turningmovements to said pattern-cam, and a frame cover adapted to be securedto said attachment frame, said cover being formed with an aperture whichis arranged so as to expose the axially projected crosssectional area ofsaid pattern-cam, both said actuating means and said cam follower beingdisposed operatively to engage said pattern-cam when said cam isinserted axially through the aperture in said cover.

6. A work-jogging attachment for a sewing machine having an attachmentframe, a work-jogging mechanism including a pattern-cam journaled forturning movement in said attachment frame, cam actuating means carriedby said attachment frame and adapted to be operated by said sewingmachine, and work-shifting means carried by said attachment frame andadapted to be driven by said pattern-cam, and a cover secured to saidframe and arranged to enclose said work-jogging mechanism, said coverbeing formed with an aperture through which said pattern-cam is freelyinsertable into operative relation with said work-jogging mechanism.

7. A work-jogging attachment for a sewing machine comprising anattachment frame, mechanism carried by said attachment frame and adaptedto be actuated by operation of said sewing machine for imparting joggingmovements to said work, a pattern-cam carried for rotation with respectto said mechanism, said pattern-cam having an axis of rotation and beingmovable axially into and out of operative relation with said mechanism,a cover secured to said attachment frame to enclose said mechanism, saidcover being formed with an aperture sized to exceed the axiallyprojected cross-sectional area of said pattern-cam, and a lid membershiftably supported by said cover for movement into and out of aposition spanning said cover aperture.

comprising an attachment frame, mechanism carried by 'said attachmentframe and adapted to be actuated by operation of said sewing machine forimparting jogging movements to said work, means associated with saidmechanism defining an axis for rotary movements of a pattern-cam, acover secured to said attachment frame to enclose said mechanism, saidcover being formed with an aperture arranged to expose a portion of saidmechanism, a pattern-cam freely insertable through said aperture intooperative relation with said pattern-cam axis defining means, a lidmember shiftably supported by said cover for movement into and out of aposition spanning said cover aperture, and means associated with saidlid member for maintaining said pattern-cam in operative relation withsaid pattern-cam axis defining means.

9. A work-jogging attachment for a sewing machine comprising anattachment frame, mechanism carried by said attachment frame and adaptedto be actuated by operation of said sewing machine for imparting joggingmovements to said work, means associated with said mechanism defining anaxis for rotary movements of a patterncam, a cover secured to saidattachment frame to enclose said mechanism, said cover being formed withan aperture arranged to expose a portion of said mechanism, a patterncamfreely insertable through said aperture into operative relation withsaid means, a lid pivotally supported on said cover for movement intoand out of a position spanning said cover aperture, and spring meanscarried by said lid and disposed to engage and maintain said pattern-camin operative relation with said pattern-cam axis defining means.

10. A work-jogging attachment for a sewing machine having an attachmentframe, work-jogging mechanism including a pattern-cam journaled forturning movement in said attachment frame, cam actuating means carriedby said attachment frame and adapted to be operated by said sewingmachine, and work-shifting means carried by said attachment frame andadapted to be driven by said pattern cam, a cover secured to said frameand arranged to enclose said work-jogging mechanism, said cover beingformed with an aperture through which said pattern-cam is freelyinsertable into operative relation with said workjogging mechanism, alid pivotally supported on said cover for movement into and out of aposition spanning said cover aperture, a spring member carried by saidlid, a first arm on said spring member arranged to cooperate with saidcover to provide a spring latch for maintaining said lid in a closedposition spanning said cover aperture, and a second arm on said springmember formed to retain said pattern cam in operative relation with saidcam actuating and work-shifting means when said lid is in closedposition.

11. A work-jogging attachment for a sewing machine comprising anattachment frame, a work-shifting member, means defining a pivotal axisabout which said work-shifting member turns with respect to saidattachment frame, a cam follower carried by said work-shifting member,an interchangeable pattern-cam, means carried by said attachment framedefining a pivotal axis for turning movement of said pattern-cam, saidaxis being parallel to the pivotal axis about which said work-shiftingmember turns with respect to said attachment frame, actuating meanscarried by said attachment frame and adapted to be operated by saidsewing machine for imparting step-by-step turning movements to saidpattern-cam, and both said actuating means and said cam follower beingdisposed operatively to engage and to disengage said pattern-cam uponaxial movement of said pattern-cam, and latch means carried by saidattachment frame for restraining said pattern-cam in operative axialposition with respect to said pivotal axis defining means.

12. In a work-jogging attachment having a means defining a pivotalaxistfor a pattern-cam, a work-feeding member, and a cam-followerassociated with said workfeeding member and movable in a path toward andaway from the pivotal axis defined by said means, an interchangeablepattern-cam member, means formed at one side of said pattern-cam memberadapted to cooperate with said pivotal axis defining means in saidattachment, a handle extending from the opposite side of said patterncammember, and a cam surface formed on said patterncam member adaptedoperatively to engage said cam follower.

13. In a work-jogging attachment having a cam supporting shaft defininga pivotal axis for a pattern-cam, a work-feeding member, and a camfollower associated with said work-feeding member and movable in a pathtoward and away from the pivotal axis defined by said cam supportingshaft, an interchangeable pattern-cam member, said pattern-cam memberbeing formed at one side with a cam supporting shaft accommodating bore,a handle extending from the opposite side of said pattern-cam member,and a cam surface formed on said pattern-cam member adapted operativelyto engage said cam-follower when said pattern cam is disposed to embracesaid cam supporting shaft.

14. In a work-jogging attachment having a cam supporting shaft defininga pivotal axis for a pattern-cam, a work-feeding member, and a camfollower pin associated with said work-feeding member and disposed toextend on an axis parallel to that of the pivotal axis defined by saidcam supporting shaft, a pattern-cam member, said pattern-cam memberbeing formed at one side with a cam-shaft accommodating bore, a followerpin accommodating cam groove formed in the same side of said pattern-cammember as said bore and a handle extending from the opposite side ofsaid pattern-cam member.

15. A work-jogging attachment for a sewing machine comprising a frame,sewing machine actuated work-jogging mechanism including aninterchangeable patterncam member, means pivotally supporting saidpatterncam member for rotation with respect to said frame, means forimparting rotary movement to said patterncam member and a work-feedingmember driven by said pattern-cam member, means formed at one side ofsaid pattern-cam member adapted to cooperate with said pivotalsupporting means, a handle extending from the opposite side of saidpattern-cam member, a cover for said work-jogging mechanism secured tosaid attachment frame, said cover being formed with an aperture arrangedto expose the axially projected cross-sectional area of said pattern-cammember, and a lid member shiftably supported by said cover for movementinto and out of a position spanning said cover aperture, said lid memberbeing formed with an aperture arranged to expose said cam handle whensaid lid member is arranged to span said cover aperture.

16. A work-jogging attachment for a sewing machine comprising, a frameadapted to be secured to said sewing machine, a cam supporting shaftsupported at one extremity in said frame, said cam supporting shafthaving a free end portion presenting a first edge, an enlarged shoulderformed on said cam supporting shaft presenting a second edge, apattern-cam having an axial cam supporting shaft accommodating boreformed therein, said bore being tapered to engage said first and secondcam supporting shaft edges, means carried by said frame and adapted tobe actuated by said sewing machine for imparting turning movement tosaid pattern-cam, a workfeeding member carried by said attachment frame,and a cam follower carried by said work-feeding member, said camactuating means and said cam follower being disposed for operativeengagement each with said patterncam when said pattern-cam is positionedto embrace said cam-supporting shaft.

17. A pattern-cam controlled work-jogging attachment for a sewingmachine comprising an attachment frame including a substantiallyhorizontally disposed base plate,

a ratchet wheel journaled on a substantially vertical axis on said framebase plate, a pawl disposed to cooperate with said ratchet wheel, meansdriven by said sewing machine for reciprocating said pawl to impartstep-bystep rotary motion to said ratchet wheel, a hub on said ratchetwheel formed with an upwardly extending free extremity, aninterchangeable pattern-cam member formed at one side with a boreadapted to accommodate the free extremity of said hub, a handle formedat the opposite side of said pattern-cam member to facilitate liftingand replacing said cam with respect to said hub, complementalinterengaging surfaces formed on said hub and on said pattern-cam memberproviding a rotational interlock between said parts, a work-feedingmember slidably pivoted with respect to said frame, and a patterncamfollower carried by said work-feeding member.

18. A work-jogging attachment for sewing machines comprising anattachment frame including a substantially horizontally disposed baseplate, a pawl carrier plate supported for translatory movement withrespect to said base plate, a pawl pivotally secured to said carrierplate, means adapted to be actuated by said sewing machine forreciprocating said carrier plate, a ratchet wheel journaled on asubstantially vertical axis on said base plate and disposed in operativeengagement with said pawl, an upstanding hub formed integral with saidratchet wheel, an interchangeable pattern-cam member formed with a boreadapted to accommodate said upstanding hub, said hub and said patterncam being provided with complemental rotationally interlocking surfacesformed for operative engagement upon a relative axial movement betweensaid hub and said cam, a work-feeding member carried by said frame, anda pattern-cam follower carried by said work-feeding member and disposedfor operative movement radially of the vertical axis of said ratchetwheel.

19. A work-jogging attachment as set forth in claim 18 in which saidpawl is formed with a T-shaped aperture having a leg portion and across-bar portion, the leg portion of said T-shaped aperture extendingradially from the pivotal axis of said pawl, a throw-out lever pivotedto said pawl carrier plate, a pin carried by said throwout lever anddisposed to enter said T-shaped aperture, and means for shifting saidthrow-out lever to position said pin either within the leg portion ofsaid T-shaped aperture so as to hold the pawl out of operative position,or within the cross-bar portion of said T-shaped aperture so as toaccommodate operative vibratory movements of said pawl about its pivotalaxis with respect to said carrier plate.

20. In a work-jogging attachment for sewing machines having anattachment frame, a shaft journaled in said attachment frame, a ratchetwheel fast on said shaft, work-jogging mechanism operated by turningmovemeu ts of said shaft, and means for imparting turning movements inone direction to said shaft, said means including an actuator shiftablysupported on said attachment frame, means adapted to be driven by saidsewing machine for imparting vibratory movement to said actuator, a pawlmember arranged to cooperate with said ratchet wheel, a pawl throw-outmember, means pivotally securing said members to said actuator on spacedpivotal axes, said pawl and throw-out members being provided one with aprojection and the other with a projection accommodating slot, said slotbeing arranged to extend radially of .the means pivotally securing saidpawl to said actuator.

21. An attachment for a sewing machine of the type having an endwisereciprocatory needle bar and a depending presser bar having a holedrilled and tapped to accommodate a presser foot fastening screw, saidattachment comprising a frame, a seat formed in said attachment frame toaccommodate said depending presser bar, a fastening screw for saidattachment adapted to be received in said tapped presser bar hole, ashank on said fastening screw formed with a necked portion of reduceddiameter, aplate extending from said attachment frame in spaced relationto the presser bar seat therein, an aperture formed in said plate toaccommodate the necked portion only of said fastening screw shank, andmeans facilitating insertion of said necked portion in said aperture tomaintain said fastening screw captive with respect to said attachmentframe, said means comprising a slot formed across said plate from saidaperture to the edge of said plate whereby said aperture may be openedto admit the necked portion of said fastening screw and thereafter maybe closed.

22. A work-jogging attachment for a sewing machine having an attachmentframe, a Work-shifting member carried by said attachment frame, apattern cam follower carried by said work-shifting member and having afree extremity, a pattern cam, mechanism actuated by said sewing machinefor turning said pattern cam, said pattern cam being provided at oneside with surfaces adapted operatively to accommodate both said camactuating mechanism and said cam follower, said surfaces eing arrangedto establish operative engagement simultaneously with both said followerand said cam actuating mechanism as said pattern cam is placed inoperative relation with the free extremity of said cam follower.

23. A work-jogging attachment for sewing machines comprising, anattachment frame, a work-shifting member, means carried by saidattachment frame for securing said work-shifting member in operativeposition, a cam follower carried by said work-shifting member, a patterncam arranged to jog said work-shifting member, means carried by saidframe defining a pivotal axis for turning movement of said pattern cam,mechanism actuated by said sewing machine for turning said pattern cam,a separable driving connection between said pattern cam and saidmechanism for turning said pattern cam, and complemental separableinterengaging means on said pattern cam and on said cam followerbeing-disposed relatively to said separable driving connection toaccommodate bodily movement of said pattern cam into orout of operativeengagement simultaneously with both said mechanism for turning saidpattern cam and said cam follower.

24. A sewing machine work-jogging attachment com prising, an attachmentframe, a work-shifting member, means carried by said attachment framefor securing said work-shifting member in operative position, a camfollower carried by said work-shifting member, a pattern cam arranged tojog said Work-shifting member, a pattern cam supporting member, meanscarried by said frame defining an operative position of said pattern camsupporting member and a pivotal axis for turning movement thereof inoperative position, mechanism actuated by the sewing machine for turningsaid pattern cam supporting member, a separable rotationallyinterlocking connection between said pattern cam and said pattern camsupporting member, and complemental separable interengaging means onsaid pattern cam and on said follower being disposed relatively to saidrotationally interlocking connection to accommodate bodily movement ofsaid pattern cam into or out of operative engagement simultaneously withboth said pattern cam supporting member and with said cam follower whileboth said cam follower and said mechanism for turning said pattern camoccupy operative positions with respect to the attachment frame.

References Cited in the file of this patent UNITED STATES PATENTS887,503 Nelson May 17, 1908 979,537 Moore Dec. 27, 1910 1,893,912Spaulding Jan. 10, 1933 2,619,925 Sharenow et al. Dec. 2, 1952 2,627,239Enos Feb. 3, 1953 2,652,796 Russell Sept. 22, 1953 2,676,558 Enos Apr.27, 1954

